Apparatus for heating rolls



Patented Apr. I8, I899.

J. JAMES.

APPARATUS FOR HEATING ROLLS.

(Application filed (No Model.)

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NITE STATES PATENT FFICE.

.IAOOB JAMES, OF IRONTON, OHIO.

APPARATUS FOR HEATING ROLLS.

SPECIFICATION forming part of Letters Patent No. 623,312, dated April 18, 1899. Application filed December 15, 1898. Serial No. 699,346. (No model.)

T0 at whom, it nut/y concern:

Be it known that I, J ACOB JAMES, a citizen of the United States, residing at Ironton, in the county of Lawrence and State of Ohio, have invented certain new and useful Improvements in Methods of Heating Rolls, of which the following is a specification.

This invention relates to means for heating rolls used for rolling sheet-iron initially, so as to prevent the sudden rise in temperature from breaking the rolls.

One of the greatest difficulties to be overcome in rolls for rolling sheet-iron or steel or any form of iron or steel where chilled rolls are used is the frequent breaking of large rolls, as theybecome cold or chilled when not in use and when started to work in rolling very hot iron the outside is exposed to sudden heat,while the center only becomes heated gradually, thus causing uneven expansion, the outside pulling away from the center, and a slight jar results in a broken roll, which entails loss in the cost of the roll, as Well as in the delay necessary to repair the damage. I overcome this difficulty by subjecting the rolls to a treatment of air heated to, say, 600 to 800, and by this means initially and gradually heat the rolls while under no pressure preparatory to theiractive use. I accomplish this by forcing a current of air through a pipe heated by means of waste heat and applying this heat to initially heat the rolls.

In the drawings the invention is shown in a conventional manner in Figures 1 and 2.

A represents an oven, which may be constructed just beneath the bottom of the heating-furnace or on top of the furnace or built in connection with the f urnace-stack, the purpose being to utilize. the waste heat, or an oven may be built specially constructed for the purpose. In this oven is placed a coil of pipe at, on one end of which is placed a fan I) for sending a current of air through the pipe. \Vhere the other end of the coil emerges from the oven, it is carried down beneath the floor or standing of the mill and then carried to of the rolls and has its ends curved so as toreach the necks of the rolls. This. pipe is perforated or filled with a series of small holes,

through which the hot air is brought in contact with the rolls. This horizontal pipe is so connected with the pipe 0 that when not in use it'can be disconnected and removed.

In practice the rolls are started an hour or so before it is desired to operate them, and the current of hot air is applied until they are heated sufficiently to take off the chill, or to the same degree of heat as that of the air applied to them, so that the danger of break age when put in use is reduced to a minimum.

I'may also add to the efliciency of my invention by utilizing a cover of sheet-iron lined with asbestos or the like, adapted to inclose the rolls, as shown in Fig. 3, while being heated. This confines the heat and allows the rolls to be heated very quickly. The cover or casing is of course removed as soon as the rolls are sufficiently heated. casing is shown at e and its lining at f.

WVhat I claim is An apparatus for gradually heating the rolls in rolling-mills economically comprising a set of rolls, a perforated pipe extending horizontally thereof and having turned-in ends in proximity to the necks of the rolls, an oven or chamber heated by the waste heat from the furnace, a coil of pipe in said oven and forcing means for sending air through said coil to the perforated pipe whereby the rolls are heated by pure air and from the waste heat, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses. v

JACOB JAMES.

Witnesses:

A. W. WILLIAMS, JOSEPH TYLER.

In Fig. 3 the 

